Image from page 63 of "Mechanics for young America; how to build boats, water motors, wind mills, searchlight, electric burglar alarm, ice boat ... etc.; the directions are plain and complete. Reprinted from Popular mechanics" (1905)

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Text Appearing Before Image:icu-larly in a storehouse about one hundred feetdistant, where they often did considerabledamage. One of the boys thought he wouldtry a plan of electrical extermination, andin order to carry out his plan he picked upan old zinc floor plate that had been usedunder a stove and mounted a wooden disc6 in. in diameter in the center. On this dische placed a small tin pan about 6 in. indiameter, being careful that none of the fas-tening nails made an electrical connectionbetween the zinc plate and the tin pan. This apparatus was placed on the floor of the warehouse where it was plainly visible -..from a window in the shop where we worked and a wire was run from the pan and another from the zinc plate through the intervening yard and into the shop. A good sized in-duction coil was through connected withthese tires and about six dry batteries wereused to run the induction coil whenever apush button was manipulated. It is quite evident that when a rat putits two fore feet on the edge of the pan

Text Appearing After Image:Electric Bat Trap in order to eat the mush which it contained,that an electrical connection would be madethrough the body of the rat, and when wepushed the button up in the shop the ratwould be thrown two or three feet in theair and let out a terrific squeak. The ar-rangement proved quite too effective, forafter a week the rats all departed and theboys all regretted that their fun was at anend.—Contributed by John D. Adams, Phoe-nix, Arizona. HOW TO BUILD A WIRELESS TELEGRAPH. An illustrated descriptive article tellinghow to build a complete working set ofwireless telegraph instruments, will appearin this department next month. BOOK FOR BOYS. We have reprinted in book form a largenumber of the articles which have appearedin the department Mechanics for YoungAmerica. Tells How to Build. Everyboy should have a copy; 64 pages; price 25cents postpaid. POPULAR MECHANICS. t>6 MECHANICS FOR YOUNG AMERICA HOW TO MAKE A MINIATURE STEAMTURBINE With an old toy steam engine boiler anda littl

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